Ono let the word out that he presented his proposal to Mega Man creator Keiji Inafune on Monday. While he does say that his presentation was a success, this is not confirmation that anything concrete is happening right now. However, we at least know that he is actively trying.

SOURCE Ono pitching new Darkstalkers title? More alts. for SSF4? @ EventHubs
RELATED Yoshinori Ono's Twitter account

Here are some screencaps of all the related Tweets so that you don't have to weed through everything -