JDK 9 Early Access build 170 is available at the new
location : - jdk.java.net/9/
A summary of all the changes in this build are listed here.
Changes which were introduced since the last availability email
that may be of interest :
b168 - JDK-8175814: Update default HttpClient protocol version
and optional request version
related to JEP 110 : HTTP/2 Client.
b169 - JDK-8178380 : Module system implementation refresh
changes in command line options
b170 - JDK-8177153 : LambdaMetafactory has default
release note: JDK-8180035
New Proposal - Mark Reinhold has asked for comments on the
jigsaw-dev mailing list 
Proposal: Allow illegal reflective access by default in JDK 9
In short, the existing "big kill switch" of the `--permit-illegal-access`
option  will become the default behavior of the JDK 9 run-time system,
though without as many warnings. The current behavior of JDK 9, in which
illegal reflective-access operations from code on the class path are not
permitted, will become the default in a future release. Nothing will
change at compile time.