When I was visiting my sister this Christmas I checked out her Slanket. It's basically in the same family as the Snuggie but like softer.
And everything I thought would improve the Snuggie back when I tried it previously on this blog actually exists on the Slanket and then some. THEY HAVE THE FOOT POCKET! Slanket totally trumps Snuggie folks. They even have a front pocket so you never have to give up control of the remote.
So if your looking to get a blanket with sleeves there is one way to go.
Unless you're so adventurous to get the siamese one.