Da Vinci's Last Supper painting, #15 has secret codes embedded in it. Anyone hear about this?

This 15th copy shows Mary Magdalene holding a baby, she's to the right of Jesus. To the left of Him there's some knights. Plus, the Holy Grail is missing. Painting appears to contain several references to the number 3. Why is this? This is a real copy that Da Vinci painted. This might be where Dan Brown got the idea Jesus & Mary were married. Christianity back then was about power, not . What's your take on this newly discovered painting?