if I could understand the gibberish from google translator then I would be not only able to 100% understand what the article is saying but also be able to give a more informed asnwer, having said that I'll try my best.
From rumours I've read the PowerVR as mentioned in the article was initially rumoured to be for the PSP2. Just when the company announced their latest mobile CPU/GPU chip, which was designed with low power consumption and low heat output with a high performance output, it was reviled that Sony had signed a deal with them...what Sony would be using these chips for no one knew but at that time Sony was rumoured to be working on a new PSP, this was before the PSP go was revealed and announced, so people put them to together and the PSP2 rumour was born.
Now as far as this chip being in the PS4 will have to be seen, Surely Sony do not want another fuck up with backwards comparability, especially now with DLC and DD content, in which case I think they will stick with Nvidia as it'll be easiest way to guarantee 100% backwards compatability on the graphics side, it just mean less work for Sony while ensuring that people can transition over with out losing all the content they've already purchased....this purchased content is what's locked the user to the platform, if Sony doesn't provide backwards compatibility for all DLC stuff, then not only will they piss off their customers but they'll be free to jump ship.
As for the CPU, again Sony will I think stay with CELL, weather it be developed by Sony and Toshiba, or a derivative of CELL developed by IBM. Yes IBM ceased R&D on CELL, but that will not stop them from using any CELL concepts that work well, which is essentially what they said, it's highly probable that IBM could potentially develop a CPU which has enough similarities to CELL that it would be ideal for Sony to use in the PS4 to again ensure backwards compatibility with out to much work on Sony's part to make things work. Now this CELL like CPU could also be intels Larabee since it's has very similar stuff, but it's just a matter of seeing what works best for Sony.
So unless PowerVR chip can provide the backwards compatibility Sony wants and needs, I highly doubt that they will be the company used for the PS4, PSP2 yes but not PS4.
Now I know allot will cite that backwards compatibility will be ditched just as it was on the PS3 in favour or something else, but unlike PS2 to PS3 backwards compatibility, PS3 to PS4 compatibility will be crucial and it's all down the DLC people bought, with out a PS3 or a PS4 to play it, all the content a user bought will be lost, so a person who's bought something is now locked to that specific platform and this isn't something Sony can fuck up, because if people over-racted when PS2 compatibility was removed from the PS3, then they'll go suicidal if PS3 compatibility is removed from PS4, and if there anything Sony lost learnt this generation is 1) not to make such an expensive console, and 2) not to remove features specially backwards compatibility.
my 2 cents
