I think that the chances of Tenga Toppa Gurren Lagann showing up are...next to nil. :) Unless it's maaaaaajorly scaled down. I think Arc-Gurren Lagann is much more likely than the final Matroska doll.
'Course...now all of a sudden, I wonder what a quadruple-combo with GaoGaiGar, Getter Ryger, Dai-Guard, and Gurren Lagann would be like...all those drills....
(Interesting thing, incidently...Spiral Energy? Green (Simeon) and pink/purple (Genome) (I remember it as being pinkish at least...). Just like Getter energy.
Could it be...SATAN!? I mean...COINCIDENCE?