Middle-aged whippersnappers like me might like to argue a semantic difference, glossing 'none' as having a speaker meaning of 'not any' rather than 'not one', therefore requiring a plural agreement.
On the other hand, I think the main difference might be register, where the singular agreement sounds completely at home in more formal registers only. As for my own usage, I would definitely use 'are' in my daily speech with direct colleagues, students, and friends, and I'll guess that's also the case for the vast majority of speakers generally.