Thanks for starting this thread. This discussion has been going on piecemeal in other threads, but now there's a good place for it.
I think the 4 craft you mentioned are perfect for the next wave. In fact, I really don't see any other options that make sense. Of course there is the rumor (albeit a well substantiated one) that they will release the Millennium Falcon and Slave I, too. Unless they were to release different versions of starfighters (color variants with new pilots), I think that about covers it for the original trilogy.
I would LOVE to see some EU craft. The Imperial Starwing Gunboat, TIE Defender and TIE Avenger from the TIE Fighter video game would be sweet! In fact, I'd love any of the ships from X-wing or TIE Fighter, but that's because those games were some of my first exposure to Star Wars outside the Original Trilogy.
Other must-see craft: Z-95 headhunter, Skipray blastboat.
The trick is, that I don't want them to release too many craft at once because if I am REALLY into this game, I think I'd like at least two of each fighter so they can have wingmen. It would just look artificial to me to have a fight between one each of a TIE fighter, TIE interceptor, TIE bomber & TIE advanced vs. X-wing, Y-wing, A-wing and B-wing. Does that make sense? It just breaks down the squadron mentality for me.