Sorry everybody, but it looks like the list of things that 6.5.3 can do (or will be able to soon) that Windows Phone 7 Series (as we assume it's known) cannot currently stands at one:

  1. Adobe Flash

So reports Phone Scoop, who quoted Adobe as saying "Microsoft and Adobe are working closely together. While the newest version of Windows Phone won't support Flash at initial availability, both companies are working to include a browser plug-in for the full Flash player in future versions of Windows Phone. More details will be shared at Microsoft MIX next month." Lest you be tempted to think this was a mix-up, Engadget has confirmed the story independently.

We're hours away from Microsoft's big announcement - stay tuned and be sure to keep an eye on for more updates!