As much as I hate to say it, or see it, we will probably get new iPod shuffles (redesigned, maybe a larger capacity), or the line may be dropped all together. There will probably be new nanos, though only a larger capacity. Why would Apple create a whole new Nano design and then drop it a year later? The first and second generation Nano's were similar in size and capacity, so I don't see any major changes for that line. As others have pointed out, the Classics can't really get that much of an upgrade, since Hitachi hasn't started producing the larger hard drives yet.
iPod touch is a bit different. I don't believe Apple will push the iPhone beyond 32GB (which is currently the largest iPod Touch). They don't want to hurt their iPod line. As such, they will release a 64GB iPod touch when they can.