Henni,

this one is directed to you. smile
I think that the Audya has some interesting and even unique sounds (like the organs), and they have more guts (or balls) compared with the Tyros, but overall the Tyros has still the edge, sound wise. I have heard the Midjay Pro demo's and, even if they say that it has a new DSP, am somewhat unconvinced. Where the Audya shines is of course in the style department and for this reason I am seriously considering a second hand Audya 4.
Finally, considering the way Ketron keeps datelines (the Midjay Pro was officially announced in 2012), I think that it's unrealistic to expect a new Audya in 2014 and, even if this was the case, I would never buy one before they iron out all the bugs (this process is still not yet completed in the current Audya).
All the best.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.