Most this stuff seems pretty unlikely, but I'd like to make a couple points:
WMA Support.
iTunes for Mac already supports ripped WMA (at least non-rights managed) correct? Supporting, at least, playback of WMA in iTunes for Windows is actually pretty simple(even rights managed), because the Windows Media technology is actually a shared resource other applications can take advantage of. So what may end up happening is iTunes has its own software for playing and ripping MP3/MP4 and then farms out the backend to Window Media for WMA support (never exposing a user to the horrible Window Media Player)
WMA support on iPod is a whole different matter though.
Blue Tooth Accessories
I think this is somewhat unlikely, but not for a lot of the reasons others have pointed out. If they are using it only for headphone output it seems that they would get a good enough performance that a lot of people would like the idea of being able to, say, keep their iPod in their bag and just wear the headphones.
The issues that I think makes this unlikely is with how you'd configure or set it up. There'd have to be some interface to configure the bluetooth, and that would require an update to the iPod software. Also I haven't heard about any Blue Tooth audio configuration in Panther (like we saw found out about the wireless keyboard and mouse support a while back), and it seems unlikely to me that Apple would release a Blue Tooth headphone for iPod that would not work on the Mac as well.
New Dock
I connect my iPod to my home stereo all the time, and I know I'm not alone. The oft rumored stereo-dock/remote control seems like a great idea that would probably sell well. But the idea of using this to playback movies or pictures on your home theater is doubtful. That would require a new version of iPhoto to export the photos, or a new version of iSync, which was just updated yesterday (with no hint of such functionality)
It also breaks from the Digital Hub model. In the digital hub model we've seen so far everything centers around the Mac, and from there connects specific tools for specific tailored functions (digital cameras, cell phones, iPod). Using iPod for photo or movies seems overly complicated, because it's not suited for that. If Apple wanted to connect the home stereo to the Digitial Hub, I'd expect a new device (like the Tivo Series 2) or something akin to a home media server. In the end adding those features would just complicate the iPod too much in my mind, and take away from the mac, which handles those functions better.
Ok, that's my thoughts on the matter.