Update NEWS for 1.8.0.pre1

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>

NEWS

@@ -1,5 +1,19 @@
-intel-vaapi-driver NEWS -- summary of changes.  2016-11-10
-Copyright (C) 2009-2016 Intel Corporation
+intel-vaapi-driver NEWS -- summary of changes.  2017-03-xx
+Copyright (C) 2009-2017 Intel Corporation
+
+Version 1.8.0 - DD.Mar.2017
+* Improve the quality of the H.264 encoder on SKL and BXT for CQP and CBR mode
+* Improve the quality of the VP8 encoder on BSW+ for CQP and CBR mode
+* Add support for H.264 VBR mode on SKL and BXT
+* Add support for VP8 VBR mode on BSW+
+* Add support for low-power H.264 encoder on BXT and KBL
+* Add support for CBR / VBR with low-power H.264 encoder on SKL+
+* Add support for CSC and scaling with 10bit P010/I010 surface
+* Optimize CSC and scaling with 8bit NV12 and I420 surface
+* Fix the wrong memory object cache setting on SKL+
+* Fix the EU number in media pipeline
+* Fix the wrong bit shift in H.264 encoder
+* Fix the 48bit graphics address on BSW+
 
 Version 1.7.3 - 10.Nov.2016
 * Add support for HEVC 10bit encoding on KBL