A Morgan Stanley analyst is suggesting that Apple's pact with retail giant Wal-Mart is set to expand soon.

"We think the partnership is broader than people think, in transition and set to expand in the near-term," wrote analyst Rebecca Runkle in a note to clients, reports E-Commerce Times.

She estimates that sales of iPods at Wal-Mart locations could boost Apple's iPod sales by 100,000 units and add $20 million in revenue each quarter.

Runkle dismisses claims that Apple has an inventory problem saying: "We do not believe Apple has a major inventory problem. We think much of the inventory chatter resulted from inventory increases ahead of broadening retail partnerships and sell-in ahead of new product launches."

She also expects more product announcements from Apple over the summer.