A couple of new developments in the 11th edition stuff:
(1) The rules have (finally) gone to print, and rulebooks are expected to start mailing within a couple of weeks.
(2) In the meanwhile, a FINAL (finally) PDF version -- with pretty pictures on the cover -- has been created for download. Print it off and stick it in your bag for easy reference... after reading it of course.
(3) We've (the SRC) created a very short (2-page) "summary of most important changes" document. If (read: "if") you already know the 10th Edition very well (read: "very well") then reading this will go a long way to helping pin-point you to the biggest changes. If you don't, then please read this in conjunction with a full read of the 11th.
All that, plus links to the UPA Rules Blog, and the 11th Edition Discussion Forum can be found on this UPA page: http://www.upa.org/ultimate/rules/11th_links (also 'www' link below).
"Check Feet" is not a 'call' / 'rule'.
It's NOT (necessarily) the receiver's call.
And "I'm in by THAT cone" will get you laughed off the field.
See you on the field!