Ok, I understand. However, as a linguist I do feel I have to point out that this is not only ambiguous, but the overall paragraph structure strongly suggests that 'Both of these' refers to the first and the second points, not the artifacts. Logical structure summary:
1. Megatexture is not perfect
2. example 1 of imperfection: problem implementing on HD-less 360
3. example 2 of imperfection: artifacts
4. new version of megatexture solves both these imperfections
It's made worse by 'couple of artifacts like', suggesting there are more than two artifacts so that 'Both' even in a limited two clause context could be incorrect. Less ambiguos would be: 'this first generation of Megatexture ... suffers from artifacts caused by the 'zoom issue' and the megatexture being mapped on a 2D grid. Both of these artifacts are solved in the new version of MegaTexture coming in id Tech 5 engine.
Finally, in a contextual sense, if the 360 is too important to neglect, then how are they going to successfully market the MegaTexture feature of their id Tech 5 engine to multiplatform developers?
I feel like I'm splitting hairs though as probably all the tech savvy people here will likely read it the way you guys did. But others may not, and if this was a reading comprehension test, you'd have failed.