My ideal retro launch lineup contains original titles from Nintendo combined with re-releases of rare titles and compilations from third parties. The idea is the ports and comps will be easy for third parties to make thus getting them some initial strong Rev game sales (launch games often sell pretty well) to get them to provide support. The reason I'm choosing rare titles and comps is because those are titles that people actually want to buy. Naturally brand new games are welcome as well but I obviously can't predict those.
Nintendo - New Mario title, one or two other original titles one of which should be a brand new property, Fire Emblem compilation collecting the NES and SNES titles for the American market. The Rev pack-in game is Nintendo Classics Vol. 1 which would contain Super Metroid and Star Fox the idea being that those are two popular classic games that have not been ported to the GBA. In the future Nintendo would release more of these volumes to fill holes in the release schedule.
Sega - Shinging Force III Complete which contains all three Scenarios all translated in English. Re-release or remake of NiGHTS. Sonic Mega Collection 2 which includes Sonic CD, Knuckles Chaotix, Sonic R, and the ultra rare Sonic Arcade game.
Capcom - Some sort of arcade beat-em-up collection containing titles like Final Fight, King of Dragons, and Knights of the Round. The idea is to finally get all those classic Capcom beat-em-ups on home consoles arcade perfect. The only problem is licenced titles like the D&D games might not be included.
Konami - Castelvania collection which includes the never released in North America Dracula XX: Rondo of Blood. A Gradius comp would be cool too.
Treasure - Treasure compilation including Radiant Silvergun, Gunstar Heroes, Guardian Heroes, etc. These games sell huge on Ebay and hardcore nuts would buy a Rev just for this title.
Square Enix - The big one. Dragon Warrior Legends (or some other generic title) that re-releases the trilogy of DWIV, V, and VI. IV is rare as hell and the other two have never been released in North America. Hell this would sell huge in Japan too. Sure SE only supports the market leader but these aren't new games and Nintendo could offer to publish them. Again this would sell some systems since the SNES Dragon Warrior titles are like brand new games over here and RPG nuts would go batsh!t over this. A domestic release of Final Fantasy III would also be huge.
Of course new titles should compliment this lineup. Ideally Nintendo should have Retro, NST, Intelligent Systems, Camelot, Hudson, and HAL all working on one launch title each. The retro releases are too pad the release schedule so prevent a drought.