Opera has posted online the reason why Opera Mobile 9.5 launched Delay.Opera Mobile 9.5 should be release on 14 July.
Opera press release:
As you can imagine, we encountered a few bugs last week that we needed to fix before we launch. Our engineering team worked through the weekend to fix the bugs. Even though our release is a beta, we’d rather spend the extra time to fix them, thus giving you a better experience. The fixes are almost complete now, but we need two more days to run the build through our quality assurance testing. The new launch date is now set for the 17th.

We’re disappointed to delay, but fixing these bugs will improve the experience with our beta and let you fully test the browser.

While Opera Mobile is a commercial version, you can also take a look at the free Opera Mini- a nice java version of internet browser.”