Also, the 3:30 to 6:00 programming was originally done at Cartoon Network's request, with the return of Toonami planned as a 3/3.5 hour block.
It would be nice if Toonami could secure Gundam Wing. I missed seeing GW when Toonami (or was it CN general?) ran the show initially, and I recall it being a well regarded Gundam series.
Would be nice if older shows were under consideration, but the biggest hurdle there is that there is often no dub available and Toonami really needs to be able to run a dubbed show for maximum audience draw. That said, if everything aligned to make it possible it would be really cool to see Mazinger Z running on Toonami and other super robot series such as even the entire Robot Romance Trilogy (Combattler V, Voltes V, and Brave Leader Daimos).
With a Pacific Rim sequel and animated series, Legendary Godzilla sequel, Toho Godzilla movie, and new King Kong all on the way I would not be surprised if Toonami picked up a super robot series/OVA.
Who knows what evil lurks in the hearts of men?