Both, the ships damage models and the sensors have been changed. And yes, you have to start a fresh career as you must re-install SHIII and apply the 1.4 patch. It wont install otherwise. This decision was made due the numerous 'TGW1.1a WONT WORK!!!" threads we got after the release of the TGW1.1a. On 99% of the cases the problem was on the users SHIII install.
And to answer your "GWX When?", very very very soon.
