The original Harmattan software release (PR 1.0) is now in an ever-diminishing minority. Harmattan PR 1.1, the first update release (introduced on week 45) took over the installed base in less than two months. Now four weeks old Harmattan PR 1.2 release has continued in the same groove, or even faster.
Hence, we have initiated steps to change the principal test environment from Harmattan PR 1.0 to Harmattan PR 1.1 in the Nokia Store. If your application previously has been rejected on account of PR1.0-incompatibility, those issues are now automatically waived.
The SDK and corresponding sysroot in the Harmattan target is not (yet) updated from PR 1.0. In other words, you will still compile against Harmattan PR 1.0 sysroot for time being. Availability of a newer sysroot and instructions on how to take it into use will be announced at an appropriate time.
And if you have already updated your device to PR1.2, you can utilize the remote device access functionality or one of the multiple QEMU variants (now available with the update to the Harmattan target) to pre-verify your application's correct behavior.
Source N9 Developer