The new issue of Arcadia informs us which are the most popular games in Japanese video arcades. Fighting games have the lion’s share, with 9 to 10 titles in the chart and Tekken reconfirms its popularity month over month.
Whilst awaiting the new Gundam vs. Gundam, NEXT is pretty steady at number 2, while we should go down until the position nr. 9 to see a non-fighting game or, at least, a non-classical fighting game: the shooter Senko no Ronde DUO by G.Rev.

Here you can see the whole chart:

1. Tekken 6: Bloodline Rebellion (=)
2. Mobile Suit Gundam: Gundam VS Gundam NEXT (=)
3. Blazblue: Continuum Shift (=)
4. Melty Blood: Actress Again (+1)
5. Guilty Gear XX Accent Core (-1)
6. Virtua Fighter 5R (+1)
7. Street Fighter IV (+2)
8. King of Fighters 2002 Unlimited Match (-2)
9. Senko no Ronde DUO (=)
10. Daemon Bride (NEW)