Core

• jQuery.require()
• jQuery.forEach
• An easy way for turning thing -> jQuery set
• jQuery.exception (easy to hook into throw)

Attributes

• removeAttr("a b c")

Data

• Use data- as a fallback

Event

• .live("hover", fn, fn), .live("toggle", fn, fn) (same goes for bind)
• Remove getData/setData
• Remove "foo!"
• Deprecate triggerHandler
• Implement a fast way for triggering lots of non-bubbling events
• Implement "remove" event
• jQuery.event.special.*.default (default action that can be preventDefaulted)

Offset

• Position from UI

Manipulation

• Templating solution (core plugin?), and a way to write templating plugins.

Ajax

• $.ajax(url, options)
• Ajax rewrite to become more extensible

Misc

• Full support for jQuery-in-XML, XUL, XHTML (with right mimetype), and SVG.