
It is not a sequel to Gunbuster so much as a OVA set in the same universe.
The Director is Tsurumaki Kazuya, who directed KareKano, Neon Genesis Evangelion, and FLCL.
IMHO the OVA's are heavily influenced by FLCL and have a similar comedy feel to it.
I thoroughly enjoyed this and highly recommend it.
Yes it is only out on fansubs now but keep your ears open, I think this is gonna be a hit.