So I've run a couple of these in Guristas Null Sec, and I'll post what I know:

First of all, you will die in a Covops, you will need something cruiser sized at least (for null sec).

I warped in, hacked the first can, and rats spawned (felt like about 90 seconds- 2 minutes) as I was hacking the second. They proceed to blow up the remaining cans and attack and warp scramble you. They then warp out after 30 seconds.

These Guristas rats were doing 155 thermal dps with 80% thermal resist (it was 100% thermal light missile damage).
The rats are not designed to be killed, they simply function as a tank check and timer for the site.
One of the cans that exploded hit me for 799 damage with 93% explosive resist.
I did not fail my hacking attempts.

Loot drop was 29 Covert Research Tools, and a Wetu Mobile Depot bpc (1 run). This was from two cans (there were four in the site)

These really seem to be designed for more than one actual person. I don't see any way to hack all the cans before the rats blow them up, with one person (I am not a particularly slow hacker, and these were green cans).

I would be curious how this compares to low/high sec sites and wormhole space.

The timer is variable. Sometimes you can get through all 4 cans, sometimes only 1.

It's rare that all 4 have anything of any particular value in them - cargo scanner is a must.

IMO the sites are way, way, WAY too easy right now.

What sec are you talking about? The rats have spawned mid way through the first or second can each time in Null sec, and the cans always had loot.

Having loot and having value are different things.

I assure you, the timer is quite variable. I don't know if it varies by security at all, though the lower sec sites do take longer to hack, but when you get an n>2, you will find that sometimes it lasts much longer than other times.

The longest I've seen so far was in low sec, where I cleared a site, docked up, dropped my loot, undocked, and it was still on scan.

No ****. I am curious how you are valuing things that have no market yet and claiming they have no worth, especially when you haven't even said what dropped, or from what. An empty can, I can understand.

Out of (malicious) curiousity, does anyone know if a Ghost Site's explosion damages every player ship on grid, or is it a specific radius?

I tend to doubt that it's the former, but I've seen stupider things on expac releases. I only ask myself because I unfortunately have been at work all night, or I'd have found out for myself.

They may not do anything, but they'll almost definitely be worth saving up.
http://www.vg247.com/2013/11/18/eve-rubicon-sets-up-ccps-greatest-mystery-yet-interview/

My suspicion is that CCP's monitering how many of these enter the system, and will calibrate need for villard wheels, covert research tools, etc, for later expansions; further, given the symbol, odds are CRTs will be used like datacores in the new type of invention.

That said, what are current NPC buy costs for these? Haven't gotten a chance to log in today. :x

I would be curious how this compares to low/high sec sites and wormhole space.

jonnypew and delonewolf have you tube vids up on them running these, they worth a look at if you haven't done them, and of course will save you a ship.

Having run a bunch of null sec ones now, I am not concerned about the tanking so much as the timer, the loot drops, and perhaps the abundance of them. I found about half a dozen in the first day, and now haven't see one for awhile, so I am guessing now that there is info out there, there are a lot more people running them.

It sounds like the timer is a lot longer in the highsec ones, perhaps even long enough to hack all the cans by one person.

Am I remembering correctly that these are anoms, meaning you can warp straight to them without any probing?

Yes. Quite 'Exploration' ...

It seems some loot from those is worth the time. I sold Wetu depot for 600m and think I chose too low a price...

You didn't. You got in early and made the maximum isk for being early. These things are/were guaranteed to drop in price, and are now at 150m in Jita. I'm also pretty impressed, I sold one of the first ones for 290m and I think I did rather well, particularly as the manufacturing cost is trivial.

The high meta depots are harder to scan if you choose to not travel with it.

Having run a bunch of null sec ones now, I am not concerned about the tanking so much as the timer, the loot drops, and perhaps the abundance of them. I found about half a dozen in the first day, and now haven't see one for awhile, so I am guessing now that there is info out there, there are a lot more people running them.

It sounds like the timer is a lot longer in the highsec ones, perhaps even long enough to hack all the cans by one person.

Edit: In both cases all the cans had their rings still spinning, so I'm fairly sure I was the first one to them.