Yesterday, I attended the launch of Nokia Lumia 925. During the slide presentation, there is one slide that specifically mentioned the Nokia Lumia 1020. From the slide, you should be able to see that Nokia Lumia 1020 will be available in Singapore from Q4 2013.
So, if you are interested in Nokia Lumia 1020, you will need to wait a bit longer. US will be getting it on the 26th July while China and some European countries will get it in Q3 2013.