Of course you (meaning "I") don't NEED the latest new offering, but as a working professional, I treat my craft with respect, and as such, use whatever tools I feel will enhance my performance (no blue pill jokes, please!!), or increase my enjoyment as I pursue this dream of continued employment in the arts.
For me, this latest Korg PA1000 has more than just a few improvements that I can benefit from. The number 1 item on my "yes" list is the glass screen.
The tilt is not as important to me as the glass surface. It's much more responsive, and probably less susceptible to pixel damage, like it's predecessors.
Next, is the ability to store chord sequences in the styles. This effectively doubles the songbook entires, because you can have "go to" changes stored with the pattern. Use it, or not - it's there waiting.
I'm sure the overall sound will be better - how much? We'll have to see (hear). I'm pretty satisfied with the sounds I have in my PA900.
Adding an extra programmable knob is nice - using it as the default MP3 volume will be very handy.

So, is it worth the extra money to upgrade? For me, yes. I like fresh, new inspiration, and I like selling my old gear before they get worn out. Make the sale easier.
After all is said and done, I probably won't get any customer reactions that justify the purchase (like I do SO OFTEN, with my Bose systems), but I sure I'll have an increased level of comfort and enjoyment on stage, and that translates to a better performance. I'm still the driver of this rig, and I intend to put all my stage tools through their paces, as I create a musical atmosphere that satisfies both my audience ( first), and myself.

Recap:
#1 - glass screen
#2 - CS storage
#3 - Sonic improvements
** all good things.

Chas you just mixed wives, divorces, and keyboards – aaaaaaaaaaaah

John C.

Bruno,
Buying a new keyboard renews interest in music. Lloyd