1. There's actually plenty of aliasing. You probably have a modern PC monitor, so it's hard to tell from "tiny" SD screens. Checkout the full-sized screens, and bring your eyes within 6-inches of the monitor. This game has stronger art-direction than The Conduit and doesn't have the candy-color contrast of Nintendo games, so aliasing is less noticeable due to the more-organic color palette.
2. The resolution on the screens is 795x448. Out of the 720x480p available "canvas" on Wii, Nintendo's games (everything but Metroid Prime 3) are typically rendered at 660x456 (helps eliminated thin black borders), while the majority of 3rd party devs (Capcom, most consistently) render their games at 640x448 with no other variation. The Grinder is apparently 448-vertical, so scaling it we get 448 * 16 / 9 = 796, the approximate width of our screens. Either HVS provided the screens as 795x448, or IGN received 640x448 screens and did the scaling themselves (with imperfect math...) to get 795x448. The overall image quality of the teaser screens are consistent with the 480p Wii videos I manually scale to widescreen -- most pixel edges look perfectly contrasted/jagged, while more-horizontal edges show some pixel interpolation.
3. The graphic effects in The Grinder are consistent with what's been shown for The Conduit. The clean, bloomy explosions and gun flares are essentially the same. As a base case, The Conduit makes aliens super shiny, but not much else. Gladiator A.D. goes OVERBOARD with shinyness, while Grinder holds back on it. And the HUD, we don't have to expect to see it from HVS shooters now because we know it can be disabled completely in The Conduit, and it's "confirmed" that kind of customization applies to The Grinder as well.
4. The in-progress game is playable at E3, and we'll know for sure.
5. As far as I can tell, HVS's WiiWare games are just experiments made for a quick buck. They're not tightly associated with existing genres. These big HVS shooters feel like established, hard-to-mess-up-making-a-genre-fitting-game focused affair with more generous dev time.