Here they say the protocol isn't changed between 1.10 and 1.10.1.
They keep coughing up those versions like crazy
It's a sign that they release a version before its entirety stable so they have to give fast Bugfixes which come fast and contain bugs too..... Bad practice
Summary from the pre-release page:
- Many many packet id changes, maybe all changed...
- 6 new packets listed
- New protocol version is 335 and string length of Locale in Client Settings changed from 7 to 16
Looks like if all packet ids and the protocol version are corrected, the new clients should be able to connect again