Anyway, until I finish that post, I can at least direct you to a few relevant links on the subject:
A bigger and much more detailed post on the rogue tanking subject will arrive in due time, but this should get you trough your day until then. Sadly I think it'll be a bit too late to be of a great lot of use. The WotLK 3.0.2 patch is coming in the next few weeks according to blizzard. This will most likely change our talent trees, as well as some of the buffs we can receive. Dodge tanking should still be possible though. Not to mention it'll be great for in pvp/arena if you can't be hit. For WotLK, building an evasion gear set will certainly be something I'll keep in mind while going trough WotLK. Even though blizzard seems to think otherwise. Quote: "We've learned a lot about itemization since then and certainly have no plans of going back to Sunwell Radiance. But don't expect to get 100% avoidance any time soon."
Another issue, is the sunwell radiance buff which all mobs in sunwell have. They get +5% hit, and lower their target's (you) dodge chance by 20%. Meaning you'd need an additional 25% evasion. This simply is unreachable. So, while we'll be able to tank most of karazhan, serpentshrine, etc. Sunwell simply won't be an option.
Something that could be a major issue however, is the threat changes in 3.0. As you may know salvation and likewise buffs will be removed. Tanks are "probably" going to have their threat modifier increased to compensate for this. e.g. a warrior will have +75% (example estimate) increased threat in defensive stance instead of +15% or whatever it is now. Rogues however, are not intended to be tanks, and thus have the same -29% threat that we've had for a long time. Threat thus will be quite difficult to keep vs the rest of the raid or whom most will have a 0% threat modifier. But that is for later concern.
For now, the goal is to get 101.8% evasion. Which is 100% +3 x 0.6% for each level that a mob is above your own.
101.8 - 59,32 = 42,48% that you'd have to get from gear alone. Not impossible.
The Dragon's eye cuts are no longer unique-equipped so you can use 3x +27 hit rating or 3x whatever you want. However, you're not limited to 3 of them in your equipment. Instead of the 7 gems x 7 stats = 49 stats, this puts them at a lowly 3x 7 stats = 21 stats. Hopefully you haven't dropped any professions to start JC yet ;) Blacksmithing is currently in the lead with 3 extra sockets, but things being as they are this is still beta and anything could change.
ps: Give Cru a poke, it's thursday and he hasn't updated yet!