Been there, asked and I got answers.
Some of my questions during the CTP 6 Public Chat were the following:

Bill Ramos[MSFT] (Expert):
Q: I noticed that CTP6 allows using custom traces for the Generic SQL Trace Collector Type (correct me if I am wrong), how do you use the collected info? Building a report on [MDW].[snapshots].[trace_data] table?
A: You are correct. Here is a sample query you can use.

USE MDW
GO
SELECT
SII.instance_name, TD.snapshot_id, STI.snapshot_time, TD.trace_info_id,
TD.SPID, TD.EventSequence, TD.StartTime, TD.Success,
TC.name AS [Category Name], TE.name AS [Event Name], TSC.subclass_name,
TSC.subclass_value, TD.TextData, TD.ApplicationName,
TD.LoginName, TD.DatabaseName, TD.ObjectName, TD.ObjectType
FROM
sys.trace_subclass_values AS TSC RIGHT OUTER JOIN
sys.trace_events AS TE INNER JOIN
sys.trace_categories AS TC ON TE.category_id = TC.category_id RIGHT OUTER JOIN
core.source_info_internal AS SII INNER JOIN
core.snapshots_internal AS SI INNER JOIN
snapshots.trace_data AS TD
ON SI.snapshot_id = TD.snapshot_id
ON SII.source_id = SI.source_id INNER JOIN
core.snapshot_timetable_internal AS STI
ON SI.snapshot_time_id = STI.snapshot_time_id
ON TE.trace_event_id = TD.EventClass
ON TSC.trace_event_id = TD.EventClass AND TSC.subclass_value = TD.EventSubClass
WHERE (TD.trace_info_id = 1)
ORDER BY TD.snapshot_id DESC


Edward Melomed (Expert):
Q: Execution plan for Analysis Services will be exposed in this release?
A: Currently we have no plans to expose this functionality in SQL Server 2008.

Bill Ramos[MSFT] (Expert):
Q: Debug feature that will be included in SSMS refers to T-SQL only (or does it include .NET code also)?
A: This is for TSQL only. There are no language projects in SSMS. You will need to use VS debugger for a full scenario

Amy Lewis (Expert):
Q: When can we see the installation enhancements ? To be honest I didn't notice them in the CTP6. And of course what enhacements will be included ?
A: Cristian - I'm not sure what you mean by installation enhancements - do you mean improvements to our installer? We did not have any improvements for the installer in FEB CTP. We had a Major push in NOV CTP and we'll have another in the Refresh CTP.
 
Michael Rys [MS] (Expert):
Q: Dave Campbel said about Data Services: "We are not using an off-the-shelf SQL Server to power this, we've taken we've taken the technology and shifted it around to make it more suitable for large-scale datacenter". Is SQL Server not suitable?
A: SQL Server is suitable for the normal large-scale enterprice data center. But a cloud data center has different requirements regarding scale out and availabilty to reduce cost (and functionality). That's why we have the Data Services. I see some of this technology migrate into SQL Server eventually, since we use the same code basis...

Michael Rys [MS] (Expert):
Q: Then Data Services is based on what? The main limit of SQL Server is the Windows limit of 64 procs. Are you running SQL Server on Unix? And I am not being sarcastic.
A: No Data services are running on Windows Server. And is based on the SQL Server code base but extended architecturally to work in a cloud data center.

Bill Ramos[MSFT] (Expert):
Q: The Object Search feature is present in CTP6?
A: No. It will be available in the CTP Refresh.

Richard [MSFT] (Expert):
Q: Is there any intention to extend PowerShell integration to Analysis Services?
A: Not for SQL Server 2008 at this time, but in the future we hope to do so. Please file a connect entry requesting this at http://connect.microsoft.com/

Kevin Farlee [MSFT] (Expert):
Q: Is there any intention to allow encrypted backups without requiring TDE ?
A: This feature will not be in Katmai, but it is on the list for a future release.
 

And a question that does not belong to me but revealx some interesting information:

Kristy RM (Expert):
Q: is there any date on when the CTP refresh is coming out?
A: The Final Release before RTM is scheduled to release 6/6.
Michael Rys [MS] (Expert): Target is earlier in the third quarter...
Kristy RM (Expert)[20:32]: SQL 2008 is scheduled to release 7/31