Well, that escalated quickly. I had a bit of extra time this evening, so I went from not knowing the new flyover was open to driving over it in a matter of less than two hours! Here's a few photos (sorry in advance for the low image quality)...
New 1/2 mile advance sign on NY 390 SB:
Second advance sign:
Final advance sign; note new flyover in background:
NY 390 SB at Lyell Ave, where new flyover splits off to left:
New flyover ramp; note the reassurance shield for I-390 next to the NY 390 mileage marker:
End of new flyover ramp; note white Toyota 4Runner entering on realigned ramp from I-490 WB:
Widened I-390 SB with exit only lane for Chili Ave:
Rush hour congestion on I-390 NB (thanks to an accident on I-490 WB):