Yes, EX4600, QFX product line, EX4300, EX9200, any newer switches all use ELS CLI format. This is covered here:
Any yes for EX4600 ports no-auto-neg is not an option, but should only apply to an interface using TX 10/100/1000 SFP, where auto-neg is generally needed. When using this configuration, auto-neg on both sides of the link must be used. See (sort of unfinished) discussion here:
For any other interfaces the speed is set by the type of SFP used (1, 10 or 40) and the interface setting, be it ge, xe, et or 40GE interface broken down to 4 x 10GE with break-out cable.
Hope this helps.