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The #1 rule about buying a new MMORPG at release is...
don't do it.
Give it at least 3-6 months before jumping in. Read the forums, talk to people, whatever, but don't jump in.
I have started about a dozen MMORPGs from day 1 or week 1 and regretted it each time. I have started another dozen within the first month and again, regretted it.
Just put any new MMORPGs in the back of your mind and wait, play something else. Then check back and see if it's worth it.
About half the games I bought in the store had a free week, and downloadable trial versions after 3-4 months. The MMORPG'er in me wants to buy the new stuff as soon as the hype starts piling up high, but my inner self has learned many times from past mistakes, and thus I have saved a boatload of cash and frustration by adhering firmly to this rule.
MMORPGs are virtual skinner boxes.