This is official information from Tamron, though the “official” announcement will come on Friday, June 23 @ 3AM EST.

Tamron Announces 18-400mm All-In-One™ Zoom
We are pleased to announce the latest addition to the all-in-one™ zoom line-up:

• 18-400mm F/3.5-5.6 Di II VC HLD all-in-one zoom lens (model B028) in Canon and Nikon mounts

The 18-400mm is a new exciting flagship lens that adds to our current line-up and exemplifies Tamron’s all-in-one expertise and the options these great lenses afford photographers of all levels. This new unprecedented all-in-one is positioned as a compact ultra-tele zoom with all-in-one, wide-angle versatility for APS-C cameras. It will target enthusiasts who desire even greater ultra-tele capability for sports, wildlife and more, but also enjoy the versatility of the all-in-one lens for various photographic opportunities. Think of a 100-400mm with portrait, 1:2.9 macro, and wide angle capability for added convenience.

The 16-300mm will remain in the line for the enthusiast customer also looking for great range and versatility, but from a more compact, all-in-one lens prioritizing wide angle for travel and full range for every-day shooting and more.

These two lenses, while similar in many ways, offer different choices for the customer from the pioneer and leader of the all-in-one zoom lens category.

KEY FEATURES:

The power of ultra-telephoto. The versatility of all-in-one.

Powerful performance that exceeds your imagination. Introducing the world’s first ultra-telephoto all-in-one zoom with a 22.2X zoom range. Now you can shoot everything from vast landscapes to details of a bird with a single lens. The latest optical design includes a complex series of elements including LD (Low Dispersion) glass and an aspherical lens. Problems like chromatic aberration and distortion are controlled throughout the entire zoom range, resulting in sharp, superior images-whether you’re shooting at wide-angle or telephoto. Capture thrilling close-up action in a snap.

• World’s first 22.2x ultra-telephoto all-in-one zoom lens
• 620mm full-frame equivalent telephoto reach
• VC for confident telephoto shooting
• HLD means quick, accurate and quiet autofocus
• 1:2.9 Max. Mag. Ratio for versatile close-up capability
• Moisture-Resistant Construction
• Compatible with TAMRON TAP-in Console™, an optional accessory product

Zeiss Milvus 35mm f/1.4 Distagon T* Specifications:

• Mount: Canon EF (ZE), Nikon F (ZF.2)
• Lens construction: 11 groups 14 pieces
• Shortest shooting distance: 0.3 m
• Maximum shooting magnification: 1: 4.6
• Filter diameter: 72 mm
• Maximum diameter × length: 84.8 mm × 124.8 mm
• Weight: 1174 g

This lens is expected to be officially announced this week.

Tamron 18-400mm f/3.5-6.3 Di II VC HLD Specifications:

• Mount: For Canon · For Nikon
• Lens construction: 11 groups of 16
• Number of diaphragm blades: 9 (circular aperture)
• Minimum shooting distance: 17.7 inches (about 0.45 m)
• Maximum magnification: 1: 2.9
• Image stabilization effect: Approximately 3.5 steps
• Filter diameter: 72 mm
• Maximum diameter × length: 3.1 in × 4.8 in (about 79 mm × 122 mm)
• Weight: 25.6 oz (about 726 g)

This lens will be officially announced this week.

Tamron will soon be announcing an 18-400mm f/3.5-6.3 Di II VC HLD superzoom for APS-C cameras alongside the new Tamron 24-70mm f/2.8 VC G2 this week.

We’re told that Tamron will announce their new 24-70mm f/2.8 DI VC USD G2 some time next week. This will come ahead of Sigma starting preorders and shipments of their brand new 24-70mm f/2.8 DG HSM OS Art.

We do not have pricing or specifications, but we do suspect Tamron could undercut the Sigma by a $100 or more.