Gaga looks like young Barbra. Could this be a photo op for Gypsy? Streisand as Rose, Gaga as Louise, who transforms into the notorious Gypsy Rose Lee by the end of the musical.
"...Although Gaga's mentioning Funny Girl, it's Brit actress Sheridan Smith who is bringing the Streisand role back to the stage, with a London revival of the story of comedian Fanny Brice scheduled for a December kick-off..." http://www.mirror.co.uk/3am/celebrit...-funny-6303762
So, it's not for a Funny Girl stage reboot.
Surprised though since Gaga stole her number 1 and Grammy. 
LEGENDS !