When he opened the fifth seal, I saw under the altar the souls of those who had been slain because of the word of God and the testimony they had maintained. They called out in a loud voice, “How long, Sovereign Lord, holy and true, until you judge the inhabitants of the earth and avenge our blood?” Revelation 6:9-10

Our new bodies will have vocal chords, so yes, you can talk to God. You can talk to Him now, so why would communication stop in heaven?

God made us for relationship and since communication is so important for a healthy relationship, talking will occur.

Don’t believe for a second that you’ll talk to Him like your friends.

“Wassup, God. Yo, are you cool?”

I don’t believe our relationship with Him will get casual.  It will always be respectful and a bit fearful, awed by His power and love.