To be honest I'm not sure what I'll miss. I thought about this long and hard, and what I like most about Cataclysm is what I like most about WoW -- the raids, groups, and guilds. All that is going to continue into Mists.
I do have some nostalgia for the old talent tress, in that they presented an almost math-like solution to picking the correct talents, and in some ways that precision appealed to me. Now I'm not saying the new talent trees are bad, they aren't, just that I appreciated the old style as well.
As far as what I'm looking forward to the most, it has to be pet battles. My secret is that I really like the Pokemon games still; they're very easy to understand but somewhat hard to master (try random battles at max level... unless you have the perfectly crafted pokemon, you're dead). Given this collect and fight aspect is coming to WoW, I just can't wait to start doing it on the live realms.
IF one doesn't buy Mists immediately, what new stuff is available?
The only things that you'll get access to is the Pandaren race and pet battles*, which is being made available to everyone despite of what expansion they have.
*Thanks to those who noted this!
Are RP realms only CRZ with other RP realms?
I believe the answer to this is yes, although I can't be sure. I know that on my RP realm (which we just transferred off of) I only saw other RP realms out in the world.
will the exp for the 80-85 leveling bracket be reduced right away with the MoP release?
It already has! The experience requirements were cut in patch 5.0.4. Leveling through Cataclysm content goes much faster now, especially the 84 to 85 grind.
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