Do you want to ge your hands dirty on the latest release of SAP NetWeaver Gateway as well as on SAP NetWeaver itself?
If yes then the you should have a look at the SCN Trial Editions: SAP NetWeaver Application Server ABAP 7.4
http://scn.sap.com/docs/DOC-41566
Since SAP NetWeaver Gateway is part of the SAP standard as of SAP NetWeaver Application Server ABAP 7.4 you can get SAP NetWeaver Gateway as well which is part of the trial editions of the latest SAP NW release.
The new sample service https://sapes1.sapdevcenter.com:443/sap/opu/odata/sap/ZGWSAMPLE_SRV is also part of the trial edition as well.
If you wanna try it out check out the document http://scn.sap.com/docs/DOC-41566 that has been posted by my colleauge Christopher Kaestner.
Best Regards,
Andre