The original Mira Standard was only made for a couple of years. In 2009, they started making the "Starla" and the Mira's started going with lesser pickups and got a change in the fretboard. PRS still wasn't selling the Mira as well as they liked so they changed the Starla to have a tremelo and the Mira became the MiraX. That only lasted a year and then the Mira returned, again with lesser hardware. In 2012 they discontinued the Mira all together, but now PRS is releasing their S2 series of guitars, which are less cosmetic versions of their high end guitars like the Custom 24. The Mira is returning to its original form under the S2 line.
In a nutshell the Mira "Standard" like the one I have pictured is now the S2 Mira. However, many are saying the pickups in the S2 are still not as good as the old Standards.