At last RIM have officially announced the BlackBerry Bold 9790 and BlackBerry Curve 9380 – two new additions to join the OS 7 portfolio. The 9790 is an improvement over the 9780 with 2.44 inch screen, complete with 360×480 resolution and powered by 1GHz of CPU power. There’s also 8GB of memory onboard and a microSD slot that gives an additional 32GB of extra space. The 9390 Curve has a larger 3.2 inch screen with a 480×360 display along with a 5 MP camera. It’s described as ‘the first all touch smartphone in the BlackBerry Curve family’. No word on prices or availability from RIM as yet, but we’ll let…