I am playing on the Beta on XBOX one, and triggered a raid for the first time.

When the Invokers summoned Vexes, they flew straight for me and were lit up red, with agro.  When they struck my character in full iron armor, they took nearly six whole hearts per hit.  Taht is more than an Enderman or the Pigmen in the Nether.

They also didn't just fly up and down towards you, but instead made a bee line straight for my charcater, seeing through walls etc.

In my opinion they are extremely dangerous now and possibly the most lethal enemy besides the main bosses in the Beta.  

Please take a look and make sure they didn't get uber buffed too much.