Yeah the 'grille' and small blasters (?) in the front do look speeder-ish, but that big round bit in the back gives me Y-wing vibes.
@PH: if they were in a contextual vacuum, these are, indeed decent designs. However, they are not (in a contextual vacuum). The TIE design is so established that any new variations on the wing design just for the sake of the 'new' design have begun to annoy me: I liked the TIEs in TFA because they were a reasonable upgrade to the old TIEs, without messing with OMG SPIKY SLANTED AIN'T IT COOL solar panel designs.
As for the rebel starfighter, it is very much a kitbash. If I could not recognise every bit of it (with the exception of those forward-swept wings) from one of the already established SW-verse fightercraft, I would not mind, but just the fact that they took a cockpit from here and a couple of engines from there and bashed them together pisses me off.
Also, what is that huge 'chin' under the cockpit and exactly what function do those long 'wings' serve? If they were, for instance, necessary to house weaponry (which would require specific casing length), that'd be fine; but I can't see why they would create such a massive silhouette when their stubby guns are mounted in front of the cockpit...