Definitely hoppable from the Westin; I ran to the Sheraton (by accident initially) a few months ago. It was still under construction at the time, but it is just over a half mile (~0.6 if I remember correctly) from the Westin - if you cut through the sports complex.

Anyone had any experience there yet? I love the Westin (both location - near the train station, and the facilities), but am open to trying the new one. (Probably not worth hopping for me though, unless there is a stay incentive later this year.)