It's better to wait for the English version, because then you can fully enjoy it with understanding and you can save up more money so you can get the booklet or a special HGSS stylus. (When I saw a Piplup stylus when Platinum came out, I was thinking they might have a Chikorita, Cyndaquil or Tododile stylus along with maybe a stylus of Lugia/Ho-oh when HGSS is out. Also, you have more time to plan a good party for your game. ^_^
Serebii added more pics to the pre-release pictures. ^_^
I'm looking forward for the Japanese version to come out. (I really hope the gym leaders are animated.)