Ai Sugiyama used to play Gold Coast regularly until she was invited to play HC two years running. She gave up SF points from Gold Coast to play HC in 2000. So if Patty is patriotic and willing to forego a few points to mix it with a Wimbledon champion and a few of his Grand Slam-winning mates, then she's as good as there.
I was thinking that they might invite Korea this year, but Yoon Jeong Cho has finals point to defend at Auckland and Hyung-Taik Lee might need to qualify for Sydney again if he isn't afforded a wildcard or direct entry. Still, you never know. A lot of Asian players view representing their countries as a higher honour than playing for themselves. If it doesn't happen for Korea, Thailand might play again since they missed out last year because of Paradorns' injury.
I'd like to see Russia, Argentina and Israel score invitations again. The problem with Russia is that there are only three top men to choose from but they choose to play in the Middle East and India. Marat Safin is still the top Russian man. From what I gather, he didn't really enjoy his last visit because it was too soon for him to resume playing again and he got frustrated and annoyed. Yevgeny Kafelnikov might get an invite since his career seems to be winding down. Mikhail Youzhny is the only other likely possibility. Out of the women, they have Anastasia Myskina and Elena Dementieva, who would both jump at the chance of playing for Russia.
Argentina should return to represent South America with Guillermo Coria and Paola Suarez. I like the sound of that team. They were the original lineup for 2002 before Coria got busted for drugs.
Israel could have Anna Pistolesi and possibly Harel Levy. The top Israeli man is Noam Okun, but Harel Levy is more well-known in Australia. Either way, I think Israel should have a shot at it.
Australia and USA will get invited. Belgium is the other possibility. They really need an African country. Morocco could be it this year, but the Morrocan men usually commit to Doha and Chennai. Younes El Aynaoui and Bahia Mouhtassine sounds like a good team. They should play-off with Israel for a spot in the main draw.
That about covers it:
Oceania - Australia
North America - USA
South America - Argentina
Eastern Europe - Russia
Asia - Korea (or Thailand)
Africa - Morocco
Western Europe - Belgium and Switzerland
Middle East - Israel