Ooh, this looks like bad news. But before you panic, Steam boxes seem like a good idea, but none are actually on-sale yet, and most PC gamers are probably gaming happily on their laptops or phones when travelling. Why add another gadget? Assuming this concept ever sees the light of day.
Still, if this has any PC power inside it at all (specs are unknown besides something quad-core) it could easily be great emulator machine and throw open an arcade-style challenge to Sony's handheld. After all, Steam has a massive library of big-name games and pretty much every indie under the sun (except TxK), and open-sourcers could have a field day hacking it to pieces. Keep your eyes peeled for this in 2015, apparently.