These are some of the best RSS feeds I've found for keeping up with HTML5. I'm doing jQuery & MVC development as well so you will find the links have a jQuery/MS angle to them.
WhenCanIUse
The oh-so-necessary caniuse.com, in RSS update format: http://feeds.feedburner.com/WhenCanIUse
ScriptJunkie
http://services.social.microsoft.com/feeds/feed/query/tag/scriptjunkieLearn/eq/ns/DiscoveryFeedTool/eq/andA good HTML, JavaScript, CSS site hosted by MS
Rachel Appel's blog
http://rachelappel.com/rss?containerid=13HTML5, JavaScript, and MVC links with a general MS angle
Smashing Magazine
http://rss1.smashingmagazine.com/feed/Really high quality articles with a focus towards the design side of the web development picture
IEBlog
blogs.msdn.com/b/ie/rss.aspxNo surprise - the focus is on IE10, but it is really a great resource for new browser tech.
MisfitGeek
http://feeds.feedburner.com/MisfitGeekJoe recently switched from MS to Mozilla. New job but he still puts out great Weekly Links summaries.
The Big Web Show
http://feeds.feedburner.com/bigwebshowA podcast covering web development & design topics
Elijah Manor/Web Dev .NET
I'm cheating on this one a little bit. Elijah is a fantastic JS & web development resource. He has a site at Web Dev .NET, but honestly these days you are better off following him on Google+
...and you can of course sign up to follow the W3C as well, although I don't think there is an HTML5-specific RSS feed.
Good luck!