Think about it. There's pretty much three categories of games: balls, inner-tubes, or some unique specialty thing. We had a ball game last year. We had a specialty game before that (Ultimate Ascent), a ball game before that (Rebound Rumble), and an inner-tube game before that (LogoMotion). I think it's about time for another resurrection of the inner-tubes.
As YouTube commenters have pointed out, the "1999 game footage" that they show is actually footage from Toroid Terror in 1997. Frank acknowledged this to blog posters with a simple "Whoops" -
http://bit.ly/177Gf1q
That's definitely a hint. Inner-tube type game with significant structural changes with respect to alliances, robot weight, field size, etc. confirmed.