According to Cowen, there could be supply issues. They are also speculating about a version with built-in cellular by the end of the year, but I'll take that with a grain of salt.
http://blogs.barrons.com/techtrader...ork-without-tether/?mod=yahoobarrons&ru=yahoo
http://blogs.barrons.com/techtrader...ork-without-tether/?mod=yahoobarrons&ru=yahoo