FUD Zilla heard Qualcomm's 28nm S4 8960 chip is currently being produced by TSMC:
Qualcomm didn’t want to comment on this when we spoke to them, but our industry sources where happy to share some details. Qualcomm will be one of the first company to test 28nm production and we don’t doubt for a second that we will see 28nm chips in phones announced in the last days of February, in time for the Mobile World Congress 2012, in Barcelona.
Qualcomm will join AMD and Nvidia in the 28nm TSMC effort. Initial reports indicate that 28nm is still a troubled process and not so great with yields. In addition, it also costs significantly more than 40nm. AMD and Nvidia are of course making graphics chips first and AMD is expected to debut by January 10, CES 2012.