I bought it recently. The 60% icon shows in your Applications in iTunes, but not on the iPhone itself.
I have only played the classic mode for any length of time, which is great, if you like Bejeweled, which I do. The endless mode looks and plays exactly like the Classic mode. Scoring seems a little different from Classic mode, with more points for each move. I'm not sure what you are curious about - but endless mode is still Bejeweled 2 with all its animation and sound effects. It does change levels as the score increases.
I have wasted plenty of time to pay off the $2.99 charge. ;-) Which for those who don't know, is LOTS cheaper than Bejeweld for other platforms.