When you want to get paid in Lightning and share an invoice it contain details like your node pubkey and optionally some route hints to let the payer easily construct a payment route from their node to yours. Note that everyone that knows your node pubkey can check its address and public capacity, but they won't be able to know channel balances.

With route blinding it'll be possible to "blind" details such as your node pubkey and the last few hops of the payment, allowing you to construct invoices that hide your node details whilst being able to receive payments. Great for receiver privacy.