If this leak from Roland Quandt over at Twitter is accurate, only one Samsung Galaxy S21 model will get microSD card expansion—and it might only be available in select regions. Quandt claims that the S21 Ultra will be the only variant to have a microSD slot. The S21 and S21+ won't have the option. He cautions that this information is for the model available in Europe, so it might be different for other regions.
GSMArena claims that it received confirmation about storage sizes for the Galaxy S21 Ultra. It will reportedly get 16GB of RAM and 512GB storage, while 128GB and 256GB storage options will "only" get 12GB of RAM. (We're pondering how 12GB seems like an insignificant amount of RAM these days.) The Galaxy S21 series's European pricing is expected to start at €850 (around CA$1,331) for the S21, €1,049 for the S21+ (CA$1,643), and €1,400 (CA$2,193) for the S21 Ultra.