Perhaps most interestingly, the documentation filed as part of the review includes the manual for the iPhone 5 as it will be distributed in Brazil, and the section addressing Siri provides input examples in Portuguese, suggesting that the iPhone 5 will launch with support for the language in Brazil.
iPhone 5 Siri instructions with examples in Portuguese
The Brazilian manual for the iPhone 4S (PDF) provided instructions translated into Portguese, but the actual examples of acceptable input remained in English.
iPhone 4S Siri instructions with examples in English
iOS 6 already brought new and expanded support for a number of languages in Siri, but Brazilian Portuguese was not included in the list.
Additional country and language support for Canada (English and Canadian French), China (Mandarin), Hong Kong (Cantonese), Italy (Italian), Korea (Korean), Mexico (Spanish), Spain (Spanish), Switzerland (Italian, French, German), Taiwan (Mandarin), US (Spanish)Apple has, however, been working hard to expand Siri's capabilities, and it appears that further increases in the language support are still part of the company's plan.