Actually, it does appear Sega has some intention of releasing this in Japan, since there was some discussion in a Japanese article recently about it. Only question is when it'll actually air in Japan...
Now, regarding whether or not this is still "anime", it isn't any different than the last series. It's still Japanese produced with some Canadian funding going into the episodes, like the previous episodes. If anything, TMS Entertainment probably produced a Japanese audio track for the series in the case that it does air in Japan, if Sonic X 53 through 78 is any indication. The focus of the series is definately for the International market, but there is still the chance of this being released in the country of origin, which being Japan. It's being written, storyboarded, directed, and animated by the Japanese studio.
The issue is whether or not if TV Tokyo dropped out of the series production, which happened with Sonic X back in 2004 when the new episodes were in production. If this is the case, there might be a similar issue that'll occur with Bakugan, in which the newer episodes may not air in Japan any time soon (if at all, but information above suggusts this may not be the case). This situation is scarely similar to Sonic X and I do hope this does not end up being the case, especially to those who did enjoy the show by the Japanese version. However, given the show's low ratings in the timeslot it was in, as well as I'm uncertain the popularity of the merchandising in general, I'm unsure what's going to happen. TMS actually removed an episode from broadcast when it was airing in Japan, which I believe was episode 40, but I'm unsure as to why (possibly an episode that wasn't important enough and was removed to get through the series as quick as possible).
I do recall once that it was mentioned that Sonic's Japanese voice actor commented that the new series would begin airing Summer 2005 in Japan. This would be around the time KiRAB Station would end broadcast of the first series, but it never went into the second half.
Now, I'm not a fan of the series, but it's not entirely that bad (and there are worse shows out there, trust me). It's just Nelvana's wonderful dialogue for the English version that doesn't quite help it, including some of the music and voice choices.
Though, the silence being kept and most violence generally wasn't omitted. I thought that was a nice touch. In any case, there are people who do like it and unfortunately for many of you, it's a show I don't going away anytime soon on the airwaves. All I can say to those is to just ignore it and pretend it's not there.
And with that, I'm done.