Yep. GXP next year, probably being released by Funimation. (Though despite what some people would like you to believe, it's NOT been officially announced yet! THERE IS NO OFFICIAL GXP LISCENSE YET!!)
In any case, if you wanna see some GXP, there's fansubs out there, as you already know... the group I am in is fansubbing it, too. Visit out IRC chan #anime-works on irc.aniverse.com (/shamelessplug)
As for OVA 3, it's in production. If you wanna wade through a Japanese website, you can find some trailers for it at
http://www.tenchi-web.comAlso, the old Tenchi GXP site is available in English at
http://www.tenchi-web.com/e/ I think
ANd then finally, if you wanna stay up to date on Tenchi stuff, the most obsessed and informed Tenchi community on the net resides on the official AIC BBS at
http://www.aicanime.com (That's their English site, so don't worry about having to fumble through Japanese

) That site actually stays up to date with releases in Japan, so news on all of AIC's anime is available there, including Tenchi.
Have fun!