Foreign spouses are already subject to the new pension system (Labor Pension Act), i.e. your pension accumulates over the years of your working life (in Taiwan) and does not start over from zero when you switch jobs. The catch is that if you receive severance pay, it's basically 50% of what you would receive under the Labor Standards Act. Most foreigners are subject to the Labor Standards Act only, so this proposal would add APRC holders to the new system.
The official announcement will probably come after the proposal is passed; I don't see anything on the MOL's website yet. In the meantime, anyone can confirm the foreign spouses provision by checking Art. 7 Par. 1 of the Labor Pension Act.
This Act applies to the persons below who are applicable under the Labor Standards Act, but does not including those whose pension are appropriated in accordance with the Private School Act:
1.Workers holding ROC citizenship;
2.Foreigners, people of China, Hong Kong or Macao residents who married ROC nationals having a registered household in the Republic of China, and who have residency status and are permitted to work in Taiwan area;
3.Foreigners, people of China, Hong Kong or Macao residents in the preceding subparagraph who have divorced their spouses or whose spouses have passed away, and are permitted in accordance with relevant laws and regulations to continue to reside and work in Taiwan area.
Par. 2 indicates that those who are not covered by the LSA can choose to join the new system anyway.
ROC nationals and persons referred to in subparagraphs 2 and 3 of the preceding paragraph who satisfy any one of the following statuses may voluntarily make payments and claim for pension in accordance with the Act:
1.Employers who actually engage in labor work;
4.Workers not applicable under the Labor Standards Act.
MOL's explanation in English: http://english.mol.gov.tw/6386/6418/6421/
The BLI has a clearer explanation in English: http://www.bli.gov.tw/en/sub.aspx?a=R3QLRFMzumM%3d (If the link doesn't work, go to www.bli.gov.tw/en, click on Labor Pension, and click on Characteristics of the New Labor Pension System.)
This is all separate from (in addition to) the old age benefits of the Labor Insurance Act, which applies to foreigners regardless of marital or residential status but does not apply to everyone (depending on the employment situation). BLI's explanation in English: http://www.bli.gov.tw/en/sub.aspx?a=BRN3K4zrsCQ%3d