The Chicago Summit on Afghanistan sponsored by NATO is slated to start on May 20th. However Pakistan may not attend. The NATO general secretary more or less implied that Pakistan was not welcomed unless it reopens closed transit routes for NATO supplies through Pakistan to Afghanistan.
However Pakistan has also suggested that unless drone strikes cease in Pakistan's tribal areas it will boycott the meeting. The U.S,. has indicated that it will not stop the attacks in fact they have been continuing even after several motion by the Pakistan parliament have demanded they cease.
A recent Pentagon report claims that terrorists still have safe havens in parts of the Tribal Areas. This no doubt means that drone attacks will not stop. The two sides seem to be at an impasse. However talks are ongoing next week to try and solve the issues outstanding. It will be politically difficult for Pakistan to give in and allow continuing drone attacks but it also wants a great deal of money several billion it feels it is owed for past efforts against terrorism. For more see this article.