* China shares slip on plenum's disappointing lack of details

* Fed's Lockhart adds to speculation of stimulus reduction at Dec policy meeting

* Investors await Yellen's Senate confirmation hearing for top Fed post

* Dollar edges away from near 2-month high vs. yen

By Lisa Twaronite

TOKYO, Nov 13 (Reuters) - Emerging Asian currencies skidded and regional shares tumbled to six-week lows on Wednesday as mixed signals from Federal Reserve officials raised fresh concerns about an imminent rollback of the U.S. central bank's asset-buying stimulus.

The Indonesian rupiah hit its weakest in more than four-and-a-half years as foreign banks sold the currency despite the central bank's surprise rate hike in the previous session, falling as much as 0.7 percent to 11,670 per dollar.

The rupee slumped to a two-month low on Wednesday after surging consumer prices sparked fears the central bank would continue to raise interest rates and undermine economic growth at a particularly vulnerable time for the currency.

The Reserve Bank of India is likely to have stepped in to prop up the rupee via state-run banks, to keep it from falling further after it opened at a nine-week low of 63.90 to the dollar, traders said.

"Pockets of firm U.S. data will reignite QE (quantitative easing) tapering concerns, pulling dollar higher and vulnerable Asian currencies lower," said Radhika Rao, economist with DBS in Singapore.

"After a brief respite, the headwinds for the Indian rupee are back at the fore by way of rate tightening fears and elevated inflation," she added.

MSCI's broadest index of Asia-Pacific shares outside Japan skidded about 1.3 percent to its lowest in more than a month, on track to mark a fifth straight losing session. Japan's Nikkei stock average slipped 0.4 percent.

Chinese shares got off to a rocky start, after the initial communique from a key Communist Party policy meeting to set a blueprint for the coming decade's reform agenda offered them few concrete details.

"Despite setting the timeline for making decisive results by 2020, the communique is still lacking details and quantifiable indicators," analysts at HSBC Global Research wrote in a note to clients.

The China Enterprises Index of the top Chinese listings in Hong Kong was down 1.9 percent, while Hong Kong's Hang Seng Index fell 1.3 percent.

U.S. S&P E-mini futures dipped 0.4 percent in Asian trade on Wednesday after the Standard & Poor's 500 Index posted modest losses in the previous session.

Investors will also be paying close attention to any comments that Fed Vice Chair Janet Yellen makes at Thursday's Senate confirmation hearing on her nomination to become the first woman to head the world's most powerful central bank.