There doesn't seem to be a confirmed, legitimate source of the "CGI Enterprise-D" claim, a Google search only really reveals the Memory Alpha page and a couple of threads on this BBS where its brought up. It certainly looks less detailed than the 2 footer, infact it reminds me of the CG Enterprise-D that appeared in the cutscenes of the game "A Final Unity". In this thread
, even Rick Sternbach doesn't know what model was used.
Did the 2 footer actually appear in new footage much after the second season? I seem to remember most of the new shots being of the 4 footer.