Update 2: Samsung has confirmed that it will be selling the Galaxy S III with both quad-core Exynos chip and LTE modem chip in Korea. This will make the variant slightly thicker at 9mm; otherwise, the 2100mAh battery will be retained. The quad-core LTE variant is said to hit the Korean market in July. Another source has mentioned that Germany and other countries in Europe will be getting the quad-core LTE variant as well, but later in October.
Update: Local Samsung representatives have refused to comment on the 2GB variant's availability in Singapore.
Consumers planning to get the Galaxy S III in Canada will be treated to one with modified hardware. Samsung has confirmed that the Canadian version will come with 2GB of RAM, LTE connectivity, and a 1.5GHz dual-core processor (rather than the quad-core Exynos chip that the non-LTE Galaxy S III has). This news comes hot on the heels of what was announced in Japan 2 weeks earlier - NTT Docomo in Japan will be shipping a similarly 2G RAM/S4 processor-equipped S III as well.
US is expected to be the next market to be grace with the 2GB RAM variant but as of now, nothing has been confirmed by Samsung yet. We still are checking with local representatives on whether the 2GB RAM, LTE version will come to Singapore, so keep your eyes peeled here. Meanwhile, check out our review on the quad-core, 1GB RAM version here.
Sources: Android Police, The Verge, GSMArena, SAMMobile