The biggest change in the TLF APIs is that the ContainerFormat, ParagraphFormat, and CharacterFormat classes have been combined into a single TextLayoutFormat class.
The next biggest change is that some formats no longer inherit within a TextFlow, or from a host format to its TextFlow, unless you set their value to "inherit".
Also, the leadingBasis and leadingDirection formats have been combined into a single leadingModel format.
A cyclone build passes enough tests that QE has given the go-ahead to check in. The marginXXX formats are broken, but this seems to be a TLF problem and we'll work with the TLF team to get them fixed ASAP.