No, As far as I know Vitalik won't be an advisor of any new ICOs. I saw this in Twitter. Currently OmiseGo and Kyber network are the two projects that he is advising. Anyway buying something just because vitalik advised that is not a good idea. You need to know about the project and the use case of its tokens. When this is counted OMG is better than Kyber network though Kyber is a good project and had a great long term potential.