Larger Surface Pro Confirmed! (Haswell)

According to Paul Thurrott, a larger Surface Pro is confirmed. Will this be a 13 inch ultrabook? Hopefully.

"I can now confirm those reports: Microsoft will indeed launch a bigger, Intel-based Surface Pro device at the event. "

http://windowsitpro.com/paul-thurrotts-wininfo/short-takes-may-9-2014