Checked and they are 2 days out? Manually updated and no change on Vista Home Premium SP2.
Mine are also two days old 140121.1 but my streaming updates were last done an hour ago so I am still protected.
Virus Definitions Update 140123-0 was released today at 10:57:10.
Mine is 140123-0 released today at 11:54.
Mine has finally updated after I chased it down manually, a rather large update too as I was watching the percentage levels tick over and it took forever.