Guild Wars 2

With the new updates, will maxing the weapons crafting achievements for Master Crafter require getting to crafting level 500 or still 400?

I would not doubt that they would add in another 10 or 20 points for reaching 500 on a craft maybe more just thinking of the new mini set 2 they recently added in..

400 is still Master, 500 is Grandmaster (from the livestream today)

Does the master crafter title achievement still require just the 8x Master achievements then?

Most likely old titles will remain the same but they will add new ones for crafting to 500.