Lightroom CC 2015.3 and Lightroom 6.3 are now available on Adobe.com. The goal of this release is to provide additional camera raw support, lens profile support and address bugs that were introduced in previous releases of Lightroom. This release also restores the Import experience available prior to Lightroom 6.2.
I was waiting for this—the import module in 6.2 increased my import times by a factor of two. Hopefully everything will be back to normal.
My plea to Adobe: Please spend the next few months optimising Lightroom for speed.