with the new layout Gmail is getting more attractive but it still lacks in some features:

No paging / endlesslist for the mails

You still have those old-school back/forward buttons on top. Modern Email clients just have a endless list that loads new items if you scroll on the bottom. You could still combine that with paging 1000 items for example. If somebody scrolls really fast there is also no need to load all items really… So if you implement it clever you could really load 1 mio items in the list and scroll down to item 510.030 without need for buttons. Or live-filter on the results showing the number of results based on the current search …
Buttons to page new items has no “jump to last” or “jump to first”

Following use-case: You search for “invoice” in your mailbox, you want to goto the VERY FIRST or LAST EMAIL. You will have to click on the button to go to the first item until you have the first page. Why is there still no “jump to first/last page” button?
Suprising that those issues still not on their feature list.