Bohemia becomes heavily Germanized, and becomes as German as Brandenburg and Prussia which was originally West Slavic like the Czechs. There are a few areas of native Czech speakers, but they are like the Wends and Sorbs, very small minorities in a sea of German speakers.
If we assume the same development as OTL, Bohemia either remains part of German Austria after WWI, or becomes a separate German speaking state. In either case, any kind of Hitler analogue would probably be able to incorporate Bohemia into the Reich without too much objection. Without industrial Bohemia, Slovakia may never become a separate nation and remain part of Hungary. However, with such a distant POD, almost any 20th century history would be butterflied so the above is more in terms of general consequences than any definite events.