This is relevant only to those who compile Simutrans-Experimental themselves from the development sources. Work on development, which has been on the way-improvements branch for quite some time now, is moving to the devel-new branch, into which all the code from the way-improvements branch is being merged. The way-improvements branch has now served its original purpose as a branch for a set of long planned way related features which are now implemented successfully and have passed basic preliminary testing.
The next set of features may well be implemented in a new branch from devel-new.