According to Famitsu magazine, the new Gundam series featuring RX-78-7 is a Playstation 3 game. The title is "Kidou Senshi Gundam Senki (Mobile Suit Gundam Battlefield Record U.C. 0081)".
The new series was announced last month but the type of the series had been unknown.
Sources: Scan of Famitsu 1
, Scan 2
, Scan 3
Bandai stated that new TV series of Gundam will not be aired this year.