I don't think Dogabaki's form will be limited, although I am pretty sure we will be watching more of single use of Garulua, Bashaa and Dogga.
With the help of a friend, I managed to translate the summary for the next episode from the official site. This is what I got:
2008: During the fight with the Fangire, Wataru had this doubting feeling of some sort.Ixa made the full-force attack, however it failed.Mami faces off against SeaStar Fangire apparently. (For this I am not sure:Mami is telling Bloody Rose about Seastar Fangire.Bloody Rose says something like "This thing is here...".)
1986:So Yuri, in a date or something, bets the violin of Mami.and then it's mentioned that it's unnecessary to think like that". It's too much to think about, if you want to play, then think only of playing, that is simple guidance".
Ok, this is what my friend got, with quite good knowledge of Japanese.