The following is a document from Avid, detailing the supported formats/frame rates within Avid projects of 24, 30 and 60 fps. Reading Avid's promotional material, you would think they completely support MXF. That's not even remotely true, as you'll see below.
Fields without a Y or N indicate that's not a valid combination.
"Tape" refers to playback of tape through the HVX's FW port.

[edit added] well dang, I did my best to reformat this to display correctly, but it isn't displaying in clear columns, so I've replaced it with a link to Avid's site. The document is revised as of February of this year, and relates to the current versions of Adrenaline (both platforms) and Express Pro.

http://www.avid.com/onlineSupport/supportcontent.asp?contentID=9082

Download HVX200 Support14.doc