Palm is only waiting two weeks, so it seems a little excessive to worry just yet (especially since finishing anything in 2 weeks seems incredibly efficient by some corporate standards). But it is okay to ask the question, and remind them in public of their obligations. Keep in mind that the "preparation" they're doing could be as simple as scrubbing everything to make sure they don't accidentally release anything pro…
Imagine what would happen if they said they still need a couple weeks to scrub everything before they would be applying for FCC approval. This is just another obligation that comes with the legal landscape they've settled into, and they shouldn't have shipped without already meeting it.
Bit different. The GPL doesn't require that the source code be immediately available. And if they had just said "sure, we'll go ahead and send that out, it will take a month to process and then however long mail takes", well... there's absolutely no GPL violation there.