A longer-lasting battery is really the only thing I miss - my iPad 3 (which, I gather, is known to be the worst battery-wise) needs charging after half a day as I play some casual games throughout the day, on and off. Definitely not for eight to ten hours total, though ... I'd say I get maybe 3-4 hours of actual use out of one 100% charge.
Still, as I largely use it at home, and would have a charging cord with me when travelling (and I've only really used it at the hotel when travelling, since it's a WiFi-only model), it's not a big deal.
I admit I occasionally get tempted by the retina Mini. I don't need it, and I think that when I'm forced to read PDFs, the regular size iPad's retina screen is probably handier anyway, but I'm still tempted (outside of phones, I have gadgetitis, what can I say?). But then I look at the price tag of ~500 € for the WiFi-only 32 GB model and ... that keeps me in check.
