Impeachment is a process (see Steely's definition). Before now it's been called an impeachment investigation and/or inquiry -- but Pelosi made it official after pressure from Dems, putting the process on a faster, tighter track.
No one knows what the outcome will be, but it doesn't have to mean removal from office. Censure is an option, too. The only thing that seems certain is senate Republicans will continue to act like Trump Toadies, sealing the GOP's reputation as hypocrites with double standards (see Lindsay Graham).