Microsoft hasn't said anything official as of yet, but it looks like the company is planning to release a version of the Arc mouse with multitouch input. The evidence is extensive and fairly convincing. First, Microsoft has registered the domain "arctouchmouse.com", which currently redirects to Bing. Several European retailers have started listing a "Microsoft Arc Touch Mouse" on their sites. The Redmond mostly software company was also known to be working on multitouch mouse concepts in their research division in 2009.
If this product does exist, what can we expect from it? Windows 7 does have multitouch functionality built right in, but most consumers don't have the hardware to take advantage of it. Even if the Arc Touch is just a PC clone of the Apple Magic Mouse, it will allow PC users a new set of experiences without buying an expensive multitouch PC.
The listings we mentioned earlier are showing the Arc Mouse as selling for about $70. Assuming that is a PC Magic Mouse, would you take a chance at that price point?