ORLANDO, Florida, April 1 (Reuters) - Stocks rose on Wednesday and oil and the dollar fell on continued optimism that de-escalation in the Middle East is imminent. U.S. President Donald Trump said the U.S. will leave Iran "pretty quickly", and attention now turns to his televised address later on Wednesday evening.

In my column today I look at whether central banks are selling Treasuries, an issue back in the spotlight as Fed custody holdings sink to a 16-year low. The answer isn't straightforward - they probably are, but not as fast as you'd think.

If you have more time to read, here are a few articles I recommend to help you make sense of what happened in markets today.

1. Trump says U.S. may exit Iran war soon and threatens toquit NATO 2. A war meant to break Iran could leave Tehran stronger,and Gulf exposed 3. Factory input costs soar worldwide as Iran war snarls upsupply chains 4. Mega IPOs set to test U.S. market depth despitevolatility 5. EXCLUSIVE-BoE's Bailey invokes 2008 lessons amid privatecredit scrutinyToday's Key Market Moves

* STOCKS: Sky of blue, sea of green. In Asia, South Korea+9%, Japan +5%. In Europe, STOXX 600 +2.5%, FTSE 100 +1.8%. OnWall Street, S&P 500 +0.7%, Nasdaq +1.2%. MSCI World has biggest2-day gain since last April. * SECTORS/SHARES: Eight S&P 500 sectors rise. Industrials,materials, tech, comms services rise 1% or more. Energy -4%,biggest fall in a year, Nike -15%, Chevron -5%. Intel +8%, EliLilly +5%. * FX: Dollar -0.4%, posts biggest two-day decline sinceearly Feb. Biggest G10 FX gainer is GBP, biggest EM gainer isCLP. * BONDS: A quiet day for U.S. Treasuries, yields up 1-2bps across the curve. Rates futures drifting back to price inFed cut this year rather than hike. * COMMODITIES/METALS: Oil down: Brent -3%, WTI -2%. Gold+2%. U.S. nat gas hits 6-month closing low.Today's Talking Points

* The address will be televised

U.S. President Donald Trump will deliver a prime-time address to the nation on Wednesday night, and is expected to "provide an important update" on Iran. It is likely to be market-moving, although in which direction, it's not clear.

That's the problem - there is no clarity. In recent days Trump has said the war is over, or the U.S. will continue bombing; re-opening the Strait of Hormuz is central to a deal, or it's not; there could be troops on the ground, or not; a deal is close at hand, or it's not. Will his TV address provide clarity?

* March madness

Despite the month of March bringing war, $100 oil and huge global supply shocks, consumers, businesses and investors seem remarkably upbeat. Sentiment surveys and purchasing managers' index indicators point to a general sense of optimism that any economic pain will be short-lived.

Investors clearly want to buy the dip. The question now is whether this optimism translates into the hard activity data. It's difficult to imagine no hit to production, trade, spending or investment. But we've been surprised before.

* U.S. nat gas at 6-month ... low?

U.S. natural gas futures fell on Tuesday to their lowest level since the Middle East conflict started on February 28, and posted their lowest close in six months. Yes, you read that correctly - lowest.

While global energy prices remain volatile and elevated, especially in Asia and Europe, U.S. gas prices are being pressured by high storage and mild weather. The front month closed on Tuesday at $2.819/mBtu, down 20% from the post-February 27 peak of $3.494 on March 9.

What could move markets tomorrow?

* Developments in the Middle East * Energy market moves * Australia trade (February) * South Korea inflation (March) * Canada trade (February) * U.S. Challenger layoffs (March) * U.S. weekly jobless claims * U.S. trade (February) * U.S. Dallas Fed President Lorie Logan speaksWant to receive Trading Day in your inbox every weekday morning? Sign up for my newsletter here.

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