bolt precursor
Yes. As frequently as they ever did, (if you want to use the word frequently in any way, shape or form to describe a precursor drop).
Be careful what you ask for
ANet may give it to you.
ANet may give it to you.
Nothing of the old methods of aquisition got changed.
Old precursors still drop as loot, can be obtained via mystic forge gambling and be bought/sold on the TP.