I wouldnt be surprised if the bomber gets a model as part of the flier push, Maybe the dias if it can be made as a conversion kit (like the Razorback), but I wouldnt hold my breath on that count.
The push to plastic is mostly complete now, until things pick up, I would expect a plastic role out like we've seen for the last decade.
Its a numbers game, its really expensive to start up a plastic line, but the actual models are cheap as chips. Its easy to sell enough kabalites, hard to sell enough wracks to make it worthwhile.
Sisters are the only 40k army without plastic troops now.