Mr. Izumi Katsuhiro (left) and Mr. Hiroaki Tanaka.
With the huge improvements as seen on V2 Assault Buster Gundam, Izumi Katsuhiro mentioned that it's now a good time for X Gundam to be released, with the support that he was involved in Gundam X's TV series when he was at Sunrise.
He even jokingly mentioned the gattai gimmick of G Falcon.
But as usual, Hiroaki Tanaka mentioned that there are going to more things which are unsuspected from Robot Damashii [Side MS], indicating that anything may be possible. So there's no definite confirmation as to whether Gundam X is going be in or not.
On whether [Side EVA] Eva Unit-1 and Provisional Unit-5 are also under development, Tanaka just said that the release after Unit-2 would be "unpredictable". ^^;
Information and image from Amiami.