GrovePi+ are compatible with Pi 2, please check the details from Dexter blog.
GrovePi+

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 3 inch
Height : 1.6 inch
Length : 5.6 inch

Item Weight: 0.96 ounce (View shipping rates and policies)
Shipping Weight: 1.6 ounce (View shipping rates and policies)

ASIN : B01ANDPDQE