Hello ikmalrozlan,
When using iCloud Photos beta, you will no longer see My Photo Stream or Camera Roll on your device. The photos that were in My Photo Stream are now located in All Photos.
The Camera Roll and My Photo Stream album are replaced with an All Photos album, which gives you the same compact scroll view, now with all your photos and videos organized by the date they were added. Learn more about finding photos in iOS 8.
After you enable iCloud Photo Library, all your original photos and videos are organized in one library. My Photo Stream will upload recent photos to share with your other devices, but iCloud Photo Library stores your originals. See how to upload originals below.
iCloud Photo Library beta FAQ
http://support.apple.com/en-us/HT204264
Cheers,
Allen