Sega just announced support for Ouya:
http://www.gamesindustry.biz/articles/2013-06-05-sega-embracing-disruptive-ouya-with-sonic
Konami said yesterday that they were not releasing Winning 11 on PS4, XB1, Vita and 3DS but Vita is getting supported:
http://kotaku.com/why-is-the-psp-getting-pro-evolution-soccer-and-not-th-511207979
As I've been saying, publishers are going to have tough decisions to make but it would foolish to ignore the potential of tapping into the android/Ipad market or to assume that tablets and phones are going to stay casual only. With such a deep install base it demands attention and once Apple and Google release a spec/standard everything will change.
If I had to guess why it hasn't happened yet, its due to the incredible improvements we see with each iteration of the technology, once a spec/standard gets released things might slow down and gravitate to the standard. The graphics on these things have improved dramatically and now that Epic is making engines, Sega dipping their toes in with Sonic titles we won't stay casual forever. Not to mention that Square has re-releasing all their FF legacy hits - at some point we'll reach critical mass and EA and Activision will have to pay attention.