Lee confirmed details about the planned workout with Porter's agent David Falk. Also, according to Falk, Porter is only planning on working out for the top three teams in the draft: the Cavaliers, the Magic, and the Wizards.
The Wizards have also been considering selecting Victor Oladipo, Ben McLemore, Nerlens Noel, and Anthony Bennett. Most mock drafts have Noel going first overall, though there is some indication (as Lee points out) that Cleveland might select Porter instead. And as we've been seeing over the past week or so, there's been plenty of debate among Wizards management and fans about possibly selecting Bennett over Porter with the third pick.
At this stage in the pre-draft process, a lot of this talk is misdirection. Teams don't want to play their hands, players and their agents want to maximize their worth, and fans love the debates. And with a draft with no clear standouts (though plenty of quality players), everyone's getting their chance to speculate. But it does appear that the most likely third overall pick is definitely working out for the team with the third overall selection.