First Nokia (going to develop WP7 smartphones?), then Html5…
According to Mary-Jo Foley, the major update that will come towards the end of the year for Windows Phone 7 will include a new Internet Explorer (9) and just like the desktop version, will include Html5 support.
Regardless to Foley's known reputation for inside information when it comes to Microsoft, it makes perfect sense to align the mobile version with the desktop one and in fact to the market.
I've been using Windows Phone 7 (Omnia 7) for a few weeks now, and after a rough start, I'm now completely addicted to the live tiles, the unique user interface, the hubs and everything that Microsoft did to make it different than anything we've seen so far. In fact, it's the first time in 3 years I've replaced my main phone (which always were iPhone) with the Omnia 7.
Html5 is becoming more and more popular (it even got an official logo now!) and we even see enterprise mobile applications go that path.
iOS, BlackBerry 6, Android, webOS – all support Html5 already, so it's definitely time for Microsoft to jump in as well.