According the blue posts:
"Right now, you receive 70 VP for the first random Cataclysm Heroic dungeon you complete each day. In 4.1, you'll receive 70 VP for the first seven random Cataclysm Heroic dungeons you complete each week. Similarly, you'll receive 140 VP for the first seven random Rise of the Zandalari Heroic dungeons (the new Zul'Aman and Zul'Gurub instances) you complete in the week, too. Collectively, you'll be able to earn up to 980 VP exclusively from Heroic dungeons, which in turn will count towards your weekly 1250 VP cap."
346 Heroics: 70 * 7 = 490 VP
353 Heroics: 140 * 7 = 980 VP
Total: 1470 VP per week
Why does the blue post say you can get only 980 VP from Heroics when running seven 346 Heroics and seven 353 Heroics yields you 1470 VP total?