Volari Gamers reports that there is a mistake in the article written by The Inquirer about the XG45 :

The tapeout won't take place in March, the XG45 won't be taped out until Q3

It isn't just an upgrade of the V8 architecture with only Pixel/Vertex Shaders 3.0 thrown in it, it will be a "brand new architecture" with Duo GPU feature in it.